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Shipboard power system (SPS) can have either ac or dc distribution systems, or a combination of both ac and dc distribution systems. However, the Navy has identified Medium-Voltage DC (MVDC) as a long-term solution for electric power distribution to meet the high power density requirements in future shipboard power systems. Thyristor bridges are a viable front-end converter topology due to its mature...
This paper proposes transformer-less dual hybrid topologies suitable for rectifier type load. Performance of the reduced switch version of the network is highlighted. It consists of two inverters, one operates at a lower frequency (typically around 550 Hz) and the other operates at higher frequency (around 20 kHz). Less number of switches is used to improve reliability and reduce cost. The low frequency...
As a new multilevel converter topology, active NPC (ANPC) converter is very competitive for utility interface of large wind turbines. To meet the harmonics limit according to standards, such as IEEE, VEDW and IEC, passive grid filter is usually required, which is bulky, heavy, and may cause parasitic resonance in the mains. This paper proposes a new 9-level ANPC converter topology to achieve filterless...
An universal active power filter controller system is proposed that adapts itself to both harmonic current source type loads as well as harmonic voltage source type loads is presented in this paper. The system level harmonic filtering application issues of a multiple and clustered harmonic producing load site, such as at an industrial load site or at a distribution substation, are addressed. Harmonic...
As an industry customer of utility, electrical arc furnace (EAF), acting as a varying and reactive power sink, is the major flicker source to influence the grid power quality. In this paper, based on the field data recorded at the electric system surrounding EAF, the flicker issues and reactive power compensation requirement are quantitatively analyzed. The possible compensation solutions, including...
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